linux-kernel - Re: poll: allow f_op->poll to sleep, take #3

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Message-ID: <4928D2A2.4030304@gmail.com>
Date:	Sun, 23 Nov 2008 12:48:50 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Brad Boyer <flar@...andria.com>
CC:	Davide Libenzi <davidel@...ilserver.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Matthew Wilcox <matthew@....cx>,
	Miklos Szeredi <miklos@...redi.hu>, arjan@...ux.intel.com,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	hch@...radead.org, Ingo Molnar <mingo@...e.hu>,
	rminnich@...dia.gov, ericvh@...il.com,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-fsdevel@...r.kernel.org
Subject: Re: poll: allow f_op->poll to sleep, take #3

Brad Boyer wrote:
> On Sun, Nov 23, 2008 at 12:05:53PM +0900, Tejun Heo wrote:
>> I thought try_to_wake_up() was made static to avoid abuse but then again
>> creating dummy waitqueue is an obvious abuse of waitqueue.  What do
>> other people think?  I'll be happy to use try_to_wake_up() directly.
> 
> Do you need all the extra arguments? The function wake_up_process()
> is already a wrapper around try_to_wake_up() and is exported, but
> it doesn't have any arguments other than the task_struct and uses
> defaults for the other arguments. I'm not sure if anything in your
> code would break by ignoring the other possible values instead of
> passing them along from the arguments into the caller.

Hmmm... there was something which made wake_up_process() inappropriate.
 Ah, okay, it was @mode.  We can add a WARN_ON() if @mode is an
unexpected value and use a fixed one - TASK_INTERRUPTIBLE or TASK_ALL -
but that's even hackier than the waitqueue hack.

Thanks.

-- 
tejun
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